Why reject the quickest way to break Spain?

Why not eliminate Spain in Europe and let its colonies break away?

The campaign follows a personal preference for a more historical, colony-first approach, despite the extra time it takes.

Eliminating Spain's European state can make its colonies fragment in the game, offering a faster route than conquering them individually. The personal preference here is for a more historical style of campaign, despite the extra time it takes. Spanish possessions in the Americas are therefore the first objective. Ceylon is an exception, taken because the Maratha Confederacy has become so powerful.